Explain the purpose of using analog-to-digital converters

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Reference no: EM131899223

QUESTION 1

(a) Name any three methods (analog or digital) to condition a signal and briefly explain each of them. (6 marks)

(b) A high-pass RC filter must drive 120 Hz noise down to 1%. Specify the filter critical frequency, values of R and C, and the attenuation of a 30 kHz signal. Use the given formula.

|V_out/V_in| = (f/f_c)/[1 + (f/f_c)²]^1/2

(c) Explain how a low pass RC filter can be built with just a resistor and a capacitor. Draw a circuit diagram to illustrate your answer and explain how the circuit functions as a low pass filter. Your answers should contain explanations on how the resistor and capacitor behave then high and low frequencies are passing through them. How they behave when subjected to high or low frequencies determine whether the filter will be a high pass or a low pass filter.

(d)

1600_A non-inverting amplifier.jpg

Figure 3: A non-inverting amplifier.

Figure 3 shows a non-inverting amplifier. Use this amplifier to design a high impedance amplifier with a voltage gain of 42. Use the given equation to determine the values of the resistors you will need to design the amplifier.

V_out = [1 + R₂/R₁]V_in

QUESTION 2

(a) Explain the purpose of using analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) in signal conditioning.

(b) Determine the digital word that results from a 3.127V input to a 5-bit ADC with a 5V reference. Use the given formula.

b₁/2 + b₂/2² + .....+ b_n/2ⁿ ≤ V_in/V_R

(c) Design and draw an amplifier circuit that can provide an output voltage related to the input voltage by V_out = 3.4V_in + 5. Hint: use two summing amplifiers to construct your circuit and suggest the values of all the resistors in the circuit. You also need to explain your chosen values for the resistors.

Reference no: EM131899223

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len1899223

3/13/2018 2:22:40 AM

7. Your assignment must be word processed (single spacing) and clearly laid out. Any additional appendices or attachments must be placed at the end of the submitted document and must be referred to in the main body of the assignment, or it will not be read by the marker. 8. All files or documents submitted must be labelled with your WOU ID and name. 9. Answer all parts in English. All necessary simulation results must be shown clearly. 10. Students are highly encouraged to passage their TMAs to the Turnitin system before submission, to encourage honest academic writing and it is not mandatory except for Project courses.

len1899223

3/13/2018 2:22:35 AM

3. The total marks for TMA 2 is 100 and contributes 25% towards the total grade. 4. TMA 2 covers topics from Units 1 – 4 of your course material. 5. TMA 2 consists of two separate parts with the first part carries 40% of the total 100% while the second part carries 60% of the total 100%. The first part consists of take home assignment. The second part is the de-couple lab session. This document consists of the first part of the assignment. 6. You must combine Part 1 & Part 2 of your TMA 2 into one single document and submit it to OAS.

len1899223

3/13/2018 2:22:26 AM

Tutor-marked Assignment 2 (TMA 2 – 25%) Evidence of plagiarism or collusion will be taken seriously and the University regulations will be applied fully. You are advised to be familiar with the University’s definitions of plagiarism and collusion. Instructions: 1. This is an individual assignment. No duplication of work will be tolerated. Any plagiarism or collusion may result in disciplinary action, in addition to ZERO mark being awarded to all involved. 2. You are to submit online of your answers in OAS system and it is your responsibility to submit your TMA correctly and timely. OAS system doesn’t allow re-submission of assignment. Marks will be awarded for correct working steps and answer.

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